import { create } from 'zustand';
import { devtools, persist } from 'zustand/middleware';
import {
  deriveAuthAndEncKeys,
  setupEncryption,
  unlockWithPassword,
  unlockWithRecovery,
  rewrapDek,
  generateIdentityKeyPair,
  wrapIdentityPrivateKey,
  unwrapIdentityPrivateKey,
  generateProfileDek,
  wrapProfileDek,
  unwrapProfileDek,
  wrapProfileDekToRecipient,
  unwrapProfileDekFromShare,
  encrypt as encryptRaw,
  decrypt as decryptRaw,
  setEncKey,
  clearEncKey,
  clearIdentityPrivate,
  clearProfileDeks,
  setIdentityPrivate,
  getIdentityPrivate,
  getEncKey,
  getActiveProfileDek,
  getActiveProfileId,
  setActiveProfileId,
  setProfileDek,
  getProfileDek,
  encryptJson,
  decryptJson,
  type CipherPayload,
} from '../crypto';
import {
  User,
  Medication,
  HealthStat,
  HealthStatType,
  DrugInteraction,
  AdherenceStats,
  Profile,
  ProfileShareListing,
  Appointment,
  CreateAppointmentRequest,
  UpdateAppointmentRequest,
} from '../types/api';
import apiService from '../services/api';

interface AuthState {
  user: User | null;
  token: string | null;
  isAuthenticated: boolean;
  isLoading: boolean;
  error: string | null;
  // Persisted wrapped DEK — safe to store (AES-GCM ciphertext, useless without
  // the password). Used by the unlock screen to re-derive the in-memory DEK
  // on page reload without a full re-login.
  wrapped_dek: string | null;
  wrapped_dek_iv: string | null;
  // Account X25519 identity keypair (Phase A1). The public key is plaintext;
  // the private key is the DEK-wrapped ciphertext blob. Persisted for the same
  // reason as the wrapped DEK — the unlock screen unwraps it into memory.
  identity_public_key: string | null;
  identity_private_key_wrapped: string | null;
  identity_private_key_wrapped_iv: string | null;

  // Actions
  login: (email: string, password: string) => Promise<void>;
  register: (username: string, email: string, password: string, recoveryPhrase?: string) => Promise<void>;
  recover: (email: string, recoveryPhrase: string, newPassword: string) => Promise<void>;
  logout: () => Promise<void>;
  clearError: () => void;
  loadUser: () => Promise<void>;
}

interface MedicationState {
  medications: Medication[];
  selectedMedication: Medication | null;
  isLoading: boolean;
  error: string | null;
  // Adherence cache: medicationId -> stats. Loaded on demand per medication.
  adherence: Record<string, AdherenceStats>;

  // Actions
  loadMedications: () => Promise<void>;
  createMedication: (data: any) => Promise<void>;
  updateMedication: (id: string, data: any) => Promise<void>;
  deleteMedication: (id: string) => Promise<void>;
  selectMedication: (medication: Medication | null) => void;
  clearError: () => void;
  loadAdherence: (medicationId: string) => Promise<void>;
  logDose: (medicationId: string, taken: boolean, notes?: string) => Promise<void>;
}

interface HealthState {
  stats: HealthStat[];
  trends: any[];
  isLoading: boolean;
  error: string | null;
  
  // Actions
  loadStats: () => Promise<void>;
  createStat: (data: any) => Promise<void>;
  updateStat: (id: string, data: any) => Promise<void>;
  deleteStat: (id: string) => Promise<void>;
  loadTrends: () => Promise<void>;
  clearError: () => void;
}

interface InteractionState {
  interactions: DrugInteraction[];
  isChecking: boolean;
  error: string | null;

  // Actions
  checkInteractions: (medications: string[]) => Promise<void>;
  checkNewMedication: (name: string, dosage: string) => Promise<void>;
  clearInteractions: () => void;
  clearError: () => void;
}

interface ProfileState {
  profiles: Profile[];
  activeProfileId: string | null;
  isLoading: boolean;
  error: string | null;
  /** Fetch all owned profiles and unwrap each per-profile DEK under the account
   *  DEK into the in-memory crypto store. Sets the first profile active. */
  loadProfiles: () => Promise<void>;
  /** Switch the active profile (whose DEK encrypts/decrypts the UI's data). */
  setActiveProfile: (profileId: string) => void;
  createProfile: (input: {
    name: string;
    kind?: string;
    relationship?: string;
  }) => Promise<void>;
  updateProfile: (profileId: string, input: {
    name: string;
    kind?: string;
    relationship?: string;
  }) => Promise<void>;
  deleteProfile: (profileId: string) => Promise<void>;
  /** Fetch profiles shared TO the current user and merge them into `profiles`,
   *  unwrapping each share's profile DEK via the recipient's identity private
   *  key. Called after loadProfiles on login/unlock. */
  loadSharedWithMe: () => Promise<void>;
  /** Owner: share a profile to a recipient by email. Fetches the recipient's
   *  identity public key, wraps the profile DEK to it via ECDH, and POSTs. */
  shareProfile: (profileId: string, recipientEmail: string) => Promise<void>;
  /** Owner: revoke a share (delete the share record server-side). */
  revokeShare: (profileId: string, recipientUserId: string) => Promise<void>;
  /** Shares the current user has created for a profile (for the owner UI). */
  profileShares: Record<string, ProfileShareListing[]>;
  loadProfileShares: (profileId: string) => Promise<void>;
  clearError: () => void;
}

interface AppointmentState {
  appointments: Appointment[];
  isLoading: boolean;
  error: string | null;
  loadAppointments: (status?: string) => Promise<void>;
  // The store receives DOMAIN data (decrypted fields from the UI) and encrypts
  // it internally before sending to the server.
  createAppointment: (data: Record<string, unknown>) => Promise<void>;
  updateAppointment: (id: string, data: Record<string, unknown>) => Promise<void>;
  deleteAppointment: (id: string) => Promise<void>;
  clearError: () => void;
}

// Auth Store
export const useAuthStore = create<AuthState>()(
  devtools(
    persist(
      (set, get) => ({
        user: null,
        token: null,
        isAuthenticated: false,
        isLoading: false,
        error: null,
        wrapped_dek: null,
        wrapped_dek_iv: null,
        identity_public_key: null,
        identity_private_key_wrapped: null,
        identity_private_key_wrapped_iv: null,

        login: async (email: string, password: string) => {
          set({ isLoading: true, error: null });
          try {
            // Zero-knowledge: derive auth secret (sent to server) + encryption key.
            const { authSecret, encKey } = await deriveAuthAndEncKeys(password);
            setEncKey(encKey);
            const response = await apiService.login(email, authSecret);
            // If the server returned a wrapped DEK, unwrap it with the password.
            if (response.wrapped_dek && response.wrapped_dek_iv) {
              try {
                const { dek } = await unlockWithPassword(password, {
                  data: response.wrapped_dek,
                  iv: response.wrapped_dek_iv,
                });
                setEncKey(dek);
                // Once the DEK is available, also unwrap the X25519 identity
                // private key (Phase A1) into in-memory storage.
                if (
                  response.identity_private_key_wrapped &&
                  response.identity_private_key_wrapped_iv
                ) {
                  try {
                    const identityPrivate = await unwrapIdentityPrivateKey(
                      {
                        data: response.identity_private_key_wrapped,
                        iv: response.identity_private_key_wrapped_iv,
                      },
                      dek,
                    );
                    setIdentityPrivate(identityPrivate);
                  } catch {
                    // Wrapped private key present but failed to unwrap —
                    // non-fatal; Phase B features will surface a re-setup need.
                  }
                }
              } catch {
                // Fallback to the PBKDF2-derived key (Phase 1 compat).
              }
            }
            set({
              user: {
                user_id: response.user_id,
                username: response.username,
                email: email,
                role: 'patient',
              },
              token: response.token,
              isAuthenticated: true,
              isLoading: false,
              wrapped_dek: response.wrapped_dek ?? null,
              wrapped_dek_iv: response.wrapped_dek_iv ?? null,
              identity_public_key: response.identity_public_key ?? null,
              identity_private_key_wrapped: response.identity_private_key_wrapped ?? null,
              identity_private_key_wrapped_iv: response.identity_private_key_wrapped_iv ?? null,
            });
          } catch (error: any) {
            clearEncKey();
            set({
              error: error.message || 'Login failed',
              isLoading: false,
              isAuthenticated: false,
            });
            throw error;
          }
        },

        register: async (username: string, email: string, password: string, recoveryPhrase?: string) => {
          set({ isLoading: true, error: null });
          try {
            // Zero-knowledge: generate a DEK, wrap it under the password KEK
            // and (if provided) the recovery KEK. Send the wrapped forms + the
            // recovery proof to the server; the server stores them verbatim.
            const setup = await setupEncryption(password, recoveryPhrase);
            setEncKey(setup.dek);

            // Phase A1: generate the account X25519 identity keypair and wrap
            // the private half under the account DEK. The public key is sent
            // plaintext; the wrapped private key is opaque ciphertext.
            const { publicKey, privateKey } = await generateIdentityKeyPair();
            const wrappedPrivate = await wrapIdentityPrivateKey(privateKey, setup.dek);
            setIdentityPrivate(privateKey);

            // Phase A2: generate the default "self" profile's DEK, wrap it
            // under the account DEK, and encrypt the display name (the chosen
            // username) under the profile DEK. The server stores both opaque
            // blobs verbatim and auto-creates the self profile.
            const defaultProfileDek = await generateProfileDek();
            const defaultWrapped = await wrapProfileDek(defaultProfileDek, setup.dek);
            const defaultNameBlob = await encryptRaw(username, defaultProfileDek);

            const response = await apiService.register({
              username,
              email,
              password: setup.authSecret,
              wrapped_dek: setup.passwordWrappedDek.data,
              wrapped_dek_iv: setup.passwordWrappedDek.iv,
              recovery_wrapped_dek: setup.recoveryWrappedDek?.data,
              recovery_wrapped_dek_iv: setup.recoveryWrappedDek?.iv,
              recovery_phrase: setup.recoveryKekHash,
              identity_public_key: publicKey,
              identity_private_key_wrapped: wrappedPrivate.data,
              identity_private_key_wrapped_iv: wrappedPrivate.iv,
              default_profile_name_data: defaultNameBlob.data,
              default_profile_name_iv: defaultNameBlob.iv,
              default_wrapped_profile_dek: defaultWrapped.data,
              default_wrapped_profile_dek_iv: defaultWrapped.iv,
            });
            // Seed the in-memory profile-DEK store with the self profile and
            // make it the active profile.
            const selfProfileId = `profile_${response.user_id}`;
            setProfileDek(selfProfileId, defaultProfileDek);
            setActiveProfileId(selfProfileId);
            set({
              user: {
                user_id: response.user_id,
                username: response.username,
                email: email,
                role: 'patient',
              },
              token: response.token,
              isAuthenticated: true,
              isLoading: false,
              wrapped_dek: setup.passwordWrappedDek.data,
              wrapped_dek_iv: setup.passwordWrappedDek.iv,
              identity_public_key: publicKey,
              identity_private_key_wrapped: wrappedPrivate.data,
              identity_private_key_wrapped_iv: wrappedPrivate.iv,
            });
          } catch (error: any) {
            set({
              error: error.message || 'Registration failed',
              isLoading: false,
              isAuthenticated: false,
            });
            throw error;
          }
        },

        recover: async (email: string, recoveryPhrase: string, newPassword: string) => {
          set({ isLoading: true, error: null });
          try {
            // 1. Fetch the recovery-wrapped DEK from the server.
            const info = await apiService.getRecoveryInfo(email);
            if (!info.recovery_enabled || !info.recovery_wrapped_dek || !info.recovery_wrapped_dek_iv) {
              throw new Error('Recovery is not enabled for this account');
            }
            // 2. Unwrap the DEK using the recovery phrase.
            const dek = await unlockWithRecovery(recoveryPhrase, {
              data: info.recovery_wrapped_dek,
              iv: info.recovery_wrapped_dek_iv,
            });
            // 3. Re-wrap the DEK under the new password.
            const newWrapped = await rewrapDek(dek, newPassword);
            // 4. Derive the new auth secret + recovery proof.
            const newAuthSecret = (await deriveAuthAndEncKeys(newPassword)).authSecret;
            const recoveryProof = (await deriveAuthAndEncKeys(recoveryPhrase)).authSecret;
            // 5. Send the recovery request.
            await apiService.recoverPassword(
              email,
              recoveryProof,
              newAuthSecret,
              newWrapped.data,
              newWrapped.iv,
            );
            // Persist the new wrapped DEK so unlock works with the new password.
            set({ isLoading: false, wrapped_dek: newWrapped.data, wrapped_dek_iv: newWrapped.iv });
          } catch (error: any) {
            clearEncKey();
            set({
              error: error.message || 'Recovery failed',
              isLoading: false,
            });
            throw error;
          }
        },

        logout: async () => {
          clearEncKey();
          clearIdentityPrivate();
          clearProfileDeks();
          await apiService.logout();
          set({
            user: null,
            token: null,
            isAuthenticated: false,
            error: null,
            wrapped_dek: null,
            wrapped_dek_iv: null,
            identity_public_key: null,
            identity_private_key_wrapped: null,
            identity_private_key_wrapped_iv: null,
          });
        },

        clearError: () => set({ error: null }),

        loadUser: async () => {
          const token = get().token;
          if (!token) return;
          
          set({ isLoading: true });
          try {
            const user = await apiService.getCurrentUser();
            set({
              user,
              isAuthenticated: true,
              isLoading: false,
            });
          } catch (error: any) {
            set({
              error: error.message,
              isLoading: false,
              isAuthenticated: false,
            });
          }
        },
      }),
      {
        name: 'normogen-auth',
        partialize: (state) => ({
          token: state.token,
          user: state.user,
          isAuthenticated: state.isAuthenticated,
          wrapped_dek: state.wrapped_dek,
          wrapped_dek_iv: state.wrapped_dek_iv,
          identity_public_key: state.identity_public_key,
          identity_private_key_wrapped: state.identity_private_key_wrapped,
          identity_private_key_wrapped_iv: state.identity_private_key_wrapped_iv,
        }),
      }
    )
  )
);

// Medication Store
export const useMedicationStore = create<MedicationState>()(
  devtools((set, get) => ({
    medications: [],
    selectedMedication: null,
    isLoading: false,
    error: null,
    adherence: {},

    loadMedications: async () => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — log in to decrypt data', isLoading: false });
        return;
      }
      set({ isLoading: true, error: null });
      try {
        const wireMeds = await apiService.getMedications(getActiveProfileId() ?? undefined);
        // Decrypt each opaque blob into domain Medication objects.
        const medications = await Promise.all(
          wireMeds.map(async (w) => {
            const data = await decryptJson<Record<string, unknown>>(w.encrypted_data, key);
            return {
              id: w.id,
              medication_id: w.medication_id,
              user_id: w.user_id,
              profile_id: w.profile_id,
              name: (data.name as string) ?? '',
              dosage: (data.dosage as string) ?? '',
              frequency: (data.frequency as string) ?? '',
              route: data.route as string | undefined,
              reason: data.reason as string | undefined,
              instructions: data.instructions as string | undefined,
              side_effects: data.sideEffects as string[] | undefined,
              prescribed_by: data.prescribedBy as string | undefined,
              prescribed_date: data.prescribedDate as string | undefined,
              start_date: data.startDate as string | undefined,
              end_date: data.endDate as string | undefined,
              notes: data.notes as string | undefined,
              tags: data.tags as string[] | undefined,
              active: w.active,
              dose_schedule: (w as any).dose_schedule ?? undefined,
              created_at: w.created_at,
              updated_at: w.updated_at,
            } as Medication;
          }),
        );
        set({ medications, isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to load medications',
          isLoading: false,
        });
      }
    },

    createMedication: async (data: any) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      set({ isLoading: true, error: null });
      try {
        // Encrypt the domain fields into an opaque blob.
        const { name, dosage, frequency, route, reason, instructions,
          side_effects, prescribed_by, prescribed_date, start_date,
          end_date, notes, tags, ...rest } = data;
        const encrypted_data = await encryptJson({
          name, dosage, frequency, route, reason, instructions,
          sideEffects: side_effects, prescribedBy: prescribed_by,
          prescribedDate: prescribed_date, startDate: start_date,
          endDate: end_date, notes, tags,
        }, key);
        const wire = await apiService.createMedication({
          profile_id: data.profile_id,
          encrypted_data,
          active: data.active,
        });
        // Decrypt the response back into a domain Medication for the store.
        const decrypted = await decryptJson<Record<string, unknown>>(wire.encrypted_data, key);
        const medication = {
          id: wire.id,
          medication_id: wire.medication_id,
          user_id: wire.user_id,
          profile_id: wire.profile_id,
          name: (decrypted.name as string) ?? '',
          dosage: (decrypted.dosage as string) ?? '',
          frequency: (decrypted.frequency as string) ?? '',
          active: wire.active,
          created_at: wire.created_at,
          updated_at: wire.updated_at,
        } as Medication;
        set((state) => ({
          medications: [...state.medications, medication],
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to create medication',
          isLoading: false,
        });
        throw error;
      }
    },

    updateMedication: async (id: string, data: any) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      set({ isLoading: true, error: null });
      try {
        // Encrypt the full updated domain record into a new blob.
        const { name, dosage, frequency, route, reason, instructions,
          side_effects, prescribed_by, prescribed_date, start_date,
          end_date, notes, tags } = data;
        const encrypted_data = await encryptJson({
          name, dosage, frequency, route, reason, instructions,
          sideEffects: side_effects, prescribedBy: prescribed_by,
          prescribedDate: prescribed_date, startDate: start_date,
          endDate: end_date, notes, tags,
        }, key);
        const wire = await apiService.updateMedication(id, {
          encrypted_data,
          active: data.active,
        });
        // Update the domain medication in the store.
        set((state) => ({
          medications: state.medications.map((med) =>
            med.medication_id === id
              ? { ...med, ...data, updated_at: wire.updated_at }
              : med,
          ),
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to update medication',
          isLoading: false,
        });
        throw error;
      }
    },

    deleteMedication: async (id: string) => {
      set({ isLoading: true, error: null });
      try {
        await apiService.deleteMedication(id);
        set((state) => ({
          medications: state.medications.filter(
            (med) => med.medication_id !== id
          ),
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to delete medication',
          isLoading: false,
        });
        throw error;
      }
    },

    selectMedication: (medication) => {
      set({ selectedMedication: medication });
    },

    clearError: () => set({ error: null }),

    loadAdherence: async (medicationId) => {
      try {
        const stats = await apiService.getAdherence(medicationId);
        set((state) => ({
          adherence: { ...state.adherence, [medicationId]: stats },
        }));
      } catch (error: any) {
        // Adherence is non-critical; surface nothing disruptive.
        set({ error: error.message || 'Failed to load adherence' });
      }
    },

    logDose: async (medicationId, taken, notes) => {
      try {
        await apiService.logDose(medicationId, { taken, notes });
        // Refresh adherence for this med so the % reflects the new dose.
        const stats = await apiService.getAdherence(medicationId);
        set((state) => ({
          adherence: { ...state.adherence, [medicationId]: stats },
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to log dose' });
        throw error;
      }
    },
  }))
);
export const useHealthStore = create<HealthState>()(
  devtools((set, get) => ({
    stats: [],
    trends: [],
    isLoading: false,
    error: null,

    loadStats: async () => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — log in to decrypt data', isLoading: false });
        return;
      }
      set({ isLoading: true, error: null });
      try {
        const wireStats = await apiService.getHealthStats(getActiveProfileId() ?? undefined);
        const stats = await Promise.all(
          wireStats.map(async (w) => {
            const data = await decryptJson<Record<string, unknown>>(w.encrypted_data, key);
            return {
              stat_id: w.id,
              user_id: w.user_id,
              stat_type: (data.stat_type as HealthStatType) ?? HealthStatType.Other,
              value: (data.value as number) ?? 0,
              unit: (data.unit as string) ?? '',
              measured_at: w.recorded_at,
              notes: data.notes as string | undefined,
            } as HealthStat;
          }),
        );
        // Compute trends client-side (server can't compute on ciphertext).
        const computedTrends = computeTrends(stats);
        set({ stats, trends: computedTrends, isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to load health stats',
          isLoading: false,
        });
      }
    },

    createStat: async (data: any) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      set({ isLoading: true, error: null });
      try {
        const d = data as any;
        const profileId = getActiveProfileId();
        const encrypted_data = await encryptJson({
          stat_type: d.stat_type,
          value: d.value,
          unit: d.unit,
          notes: d.notes,
        }, key);
        const wire = await apiService.createHealthStat({
          profile_id: profileId ?? '',
          encrypted_data,
          recorded_at: d.measured_at,
        });
        const stat: HealthStat = {
          stat_id: wire.id,
          user_id: wire.user_id,
          stat_type: d.stat_type,
          value: d.value,
          unit: d.unit,
          measured_at: wire.recorded_at,
          notes: d.notes,
        };
        set((state) => ({
          stats: [...state.stats, stat],
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to create stat',
          isLoading: false,
        });
        throw error;
      }
    },

    updateStat: async (id: string, data: any) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      try {
        const d = data as any;
        const encrypted_data = await encryptJson({
          stat_type: d.stat_type,
          value: d.value,
          unit: d.unit,
          notes: d.notes,
        }, key);
        await apiService.updateHealthStat(id, { encrypted_data });
        set((state) => ({
          stats: state.stats.map((s) =>
            s.stat_id === id ? { ...s, ...d } : s,
          ),
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to update stat' });
        throw error;
      }
    },

    deleteStat: async (id: string) => {
      try {
        await apiService.deleteHealthStat(id);
        set((state) => ({
          stats: state.stats.filter((s) => s.stat_id !== id),
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to delete stat' });
        throw error;
      }
    },

    loadTrends: async () => {
      // Trends are now computed client-side in loadStats.
      const computedTrends = computeTrends(get().stats);
      set({ trends: computedTrends });
    },

    clearError: () => set({ error: null }),
  }))
);

/** Compute trend data from decrypted stats (client-side, since the server
 * can't compute trends on ciphertext). */
function computeTrends(stats: HealthStat[]): any[] {
  const byType: Record<string, HealthStat[]> = {};
  for (const s of stats) {
    const key = String(s.stat_type);
    (byType[key] ??= []).push(s);
  }
  const trends: any[] = [];
  for (const [type, items] of Object.entries(byType)) {
    const values = items.map((s) => s.value);
    if (values.length === 0) continue;
    const avg = values.reduce((a, b) => a + b, 0) / values.length;
    const min = Math.min(...values);
    const max = Math.max(...values);
    trends.push({
      stat_type: type,
      average: avg,
      min,
      max,
      trend: 'stable' as const,
      data_points: items,
    });
  }
  return trends;
}

// Interaction Store (Phase 2.8)
export const useInteractionStore = create<InteractionState>()(
  devtools((set, get) => ({
    interactions: [],
    isChecking: false,
    error: null,

    checkInteractions: async (medications: string[]) => {
      set({ isChecking: true, error: null });
      try {
        const interactions = await apiService.checkInteractions(medications);
        set({ interactions, isChecking: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to check interactions',
          isChecking: false,
        });
      }
    },

    checkNewMedication: async (name: string, dosage: string) => {
      set({ isChecking: true, error: null });
      try {
        const interactions = await apiService.checkNewMedication(name, dosage);
        set({ interactions, isChecking: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to check medication',
          isChecking: false,
        });
      }
    },

    clearInteractions: () => set({ interactions: [] }),
    clearError: () => set({ error: null }),
  }))
);

// Profile Store (Phase A2: multi-profile + per-profile DEKs)
export const useProfileStore = create<ProfileState>()(
  devtools((set, get) => ({
    profiles: [],
    activeProfileId: null,
    isLoading: false,
    error: null,
    profileShares: {},

    loadProfiles: async () => {
      const accountDek = getEncKey();
      if (!accountDek) {
        set({ error: 'No account key — log in to decrypt profiles', isLoading: false });
        return;
      }
      set({ isLoading: true, error: null });
      try {
        const wireList = await apiService.listProfiles();
        // Unwrap each profile's DEK under the account DEK, and decrypt each
        // profile's display name under that profile's DEK.
        const profiles: Profile[] = [];
        for (const wire of wireList) {
          let profileDek = getProfileDek(wire.profile_id);
          if (!profileDek) {
            try {
              profileDek = await unwrapProfileDek(
                { data: wire.wrapped_profile_dek, iv: wire.wrapped_profile_dek_iv },
                accountDek,
              );
              setProfileDek(wire.profile_id, profileDek);
            } catch {
              // Could not unwrap this profile's DEK — skip it; the UI will
              // show the profiles it could decrypt.
              continue;
            }
          }
          let name = '';
          if (wire.name_data && wire.name_iv && profileDek) {
            try {
              name = await decryptRaw({ data: wire.name_data, iv: wire.name_iv }, profileDek);
            } catch { name = ''; }
          }
          profiles.push({
            profile_id: wire.profile_id,
            owner_account_id: wire.owner_account_id,
            name,
            kind: wire.kind,
            relationship: wire.relationship,
            role: wire.role,
            permissions: wire.permissions,
            created_at: wire.created_at,
            updated_at: wire.updated_at,
          });
        }
        // Set the first profile active if none is selected (or if the active
        // one is no longer present).
        const currentActive = getActiveProfileId();
        const stillOwned = profiles.some((p) => p.profile_id === currentActive);
        const newActive = stillOwned ? currentActive : (profiles[0]?.profile_id ?? null);
        if (newActive) setActiveProfileId(newActive);
        set({ profiles, activeProfileId: newActive, isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to load profiles',
          isLoading: false,
        });
      }
    },

    setActiveProfile: (profileId) => {
      setActiveProfileId(profileId);
      set({ activeProfileId: profileId });
    },

    createProfile: async ({ name, kind = 'human', relationship = '' }) => {
      const accountDek = getEncKey();
      if (!accountDek) {
        set({ error: 'No account key — cannot create profile' });
        throw new Error('No account key');
      }
      set({ isLoading: true, error: null });
      try {
        // Generate a fresh profile DEK, wrap it under the account DEK, and
        // encrypt the display name under the new profile DEK.
        const profileDek = await generateProfileDek();
        const wrapped = await wrapProfileDek(profileDek, accountDek);
        const nameBlob = await encryptRaw(name, profileDek);
        const wire = await apiService.createProfile({
          kind,
          relationship,
          name_data: nameBlob.data,
          name_iv: nameBlob.iv,
          wrapped_profile_dek: wrapped.data,
          wrapped_profile_dek_iv: wrapped.iv,
        });
        // Cache the DEK in memory (we already have it) and set this profile
        // active — the user just created it.
        setProfileDek(wire.profile_id, profileDek);
        setActiveProfileId(wire.profile_id);
        const profile: Profile = {
          profile_id: wire.profile_id,
          owner_account_id: wire.owner_account_id,
          name,
          kind: wire.kind,
          relationship: wire.relationship,
          role: wire.role,
          permissions: wire.permissions,
          created_at: wire.created_at,
          updated_at: wire.updated_at,
        };
        set((state) => ({
          profiles: [...state.profiles, profile],
          activeProfileId: wire.profile_id,
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to create profile',
          isLoading: false,
        });
        throw error;
      }
    },

    updateProfile: async (profileId, { name, kind, relationship }) => {
      const profileDek = getProfileDek(profileId);
      if (!profileDek) {
        set({ error: 'No profile key — switch to or unlock this profile first' });
        throw new Error('No profile key');
      }
      set({ isLoading: true, error: null });
      try {
        const nameBlob = await encryptRaw(name, profileDek);
        const wire = await apiService.updateProfile(profileId, {
          name_data: nameBlob.data,
          name_iv: nameBlob.iv,
          kind: kind ?? 'human',
          relationship: relationship ?? '',
        });
        set((state) => ({
          profiles: state.profiles.map((p) =>
            p.profile_id === profileId
              ? {
                  ...p,
                  name,
                  kind: wire.kind,
                  relationship: wire.relationship,
                  updated_at: wire.updated_at,
                }
              : p,
          ),
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to update profile',
          isLoading: false,
        });
        throw error;
      }
    },

    deleteProfile: async (profileId) => {
      set({ isLoading: true, error: null });
      try {
        await apiService.deleteProfile(profileId);
        const remaining = get().profiles.filter((p) => p.profile_id !== profileId);
        // If we deleted the active profile, fall back to the first remaining.
        let newActive = getActiveProfileId();
        if (newActive === profileId) {
          newActive = remaining[0]?.profile_id ?? null;
          if (newActive) setActiveProfileId(newActive);
        }
        set({ profiles: remaining, activeProfileId: newActive, isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to delete profile',
          isLoading: false,
        });
        throw error;
      }
    },

    loadSharedWithMe: async () => {
      // Recipient path: profiles shared TO the current user. Each share's
      // profile DEK is wrapped under an ECDH-derived key; unwrap it with the
      // identity private key, then decrypt the display name under the profile
      // DEK. Merge into the profiles list with is_shared = true.
      const myIdentityPrivate = getIdentityPrivate();
      if (!myIdentityPrivate) {
        // No identity key unlocked — can't unwrap shared profile DEKs. Silently
        // skip; the owned-profile list still loads.
        return;
      }
      try {
        const shared = await apiService.listSharedWithMe();
        const sharedProfiles: Profile[] = [];
        for (const s of shared) {
          // Skip if we already have the DEK in memory (avoid re-unwrapping).
          let profileDek = getProfileDek(s.profile_id);
          if (!profileDek) {
            try {
              profileDek = await unwrapProfileDekFromShare(
                { data: s.wrapped_profile_dek, iv: s.wrapped_profile_dek_iv },
                s.ephemeral_public_key,
                myIdentityPrivate,
              );
              setProfileDek(s.profile_id, profileDek);
            } catch {
              continue; // couldn't unwrap — skip this share
            }
          }
          let name = '';
          if (s.name_data && s.name_iv && profileDek) {
            try {
              name = await decryptRaw({ data: s.name_data, iv: s.name_iv }, profileDek);
            } catch { name = ''; }
          }
          sharedProfiles.push({
            profile_id: s.profile_id,
            owner_account_id: s.owner_account_id,
            name,
            kind: s.kind,
            relationship: s.relationship,
            role: 'patient',
            permissions: s.permissions,
            created_at: s.created_at,
            updated_at: s.created_at,
            is_shared: true,
          });
        }
        // Merge: replace any prior shared entries, keep owned ones intact.
        const owned = get().profiles.filter((p) => !p.is_shared);
        const merged = [...owned, ...sharedProfiles];
        set({ profiles: merged });
      } catch (error: any) {
        // Non-fatal: owned profiles still work.
        set({ error: error.message || 'Failed to load shared profiles' });
      }
    },

    shareProfile: async (profileId, recipientEmail) => {
      // Owner path: fetch recipient pubkey, wrap the profile DEK to it, POST.
      const myIdentityPrivate = getIdentityPrivate();
      const profileDek = getProfileDek(profileId);
      if (!myIdentityPrivate) {
        set({ error: 'No identity key unlocked — cannot share' });
        throw new Error('No identity key');
      }
      if (!profileDek) {
        set({ error: 'No profile key — switch to the profile first' });
        throw new Error('No profile key');
      }
      set({ isLoading: true, error: null });
      try {
        const { identity_public_key: recipientPub } =
          await apiService.getUserPublicKey(recipientEmail);
        const envelope = await wrapProfileDekToRecipient(
          profileDek,
          recipientPub,
          myIdentityPrivate,
        );
        await apiService.createProfileShare(profileId, {
          recipient_email: recipientEmail,
          ephemeral_public_key: envelope.ephemeralPublicKey,
          wrapped_profile_dek: envelope.wrappedProfileDek.data,
          wrapped_profile_dek_iv: envelope.wrappedProfileDek.iv,
          permissions: ['read'],
        });
        // Refresh the share listing for this profile.
        await get().loadProfileShares(profileId);
        set({ isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to share profile',
          isLoading: false,
        });
        throw error;
      }
    },

    revokeShare: async (profileId, recipientUserId) => {
      set({ isLoading: true, error: null });
      try {
        await apiService.deleteProfileShare(profileId, recipientUserId);
        await get().loadProfileShares(profileId);
        set({ isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to revoke share',
          isLoading: false,
        });
        throw error;
      }
    },

    loadProfileShares: async (profileId) => {
      try {
        const shares = await apiService.listProfileShares(profileId);
        set((state) => ({
          profileShares: { ...state.profileShares, [profileId]: shares },
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to load shares' });
      }
    },

    clearError: () => set({ error: null }),
  })),
);

// Appointment Store
export const useAppointmentStore = create<AppointmentState>()(
  devtools((set) => ({
    appointments: [],
    isLoading: false,
    error: null,

    loadAppointments: async (status) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — log in to decrypt data', isLoading: false });
        return;
      }
      set({ isLoading: true, error: null });
      try {
        const wireAppts = await apiService.getAppointments(status, getActiveProfileId() ?? undefined);
        const appointments = await Promise.all(
          wireAppts.map(async (w) => {
            const data = await decryptJson<Record<string, unknown>>(w.encrypted_data, key);
            return {
              id: w.id,
              appointment_id: w.appointment_id,
              user_id: w.user_id,
              profile_id: w.profile_id,
              title: (data.title as string) ?? '',
              provider: (data.provider as string) ?? '',
              appointment_type: (data.appointmentType as string) ?? '',
              date_time: (data.dateTime as string) ?? '',
              location: data.location as string | undefined,
              duration_minutes: data.durationMinutes as number | undefined,
              reason: data.reason as string | undefined,
              notes: data.notes as string | undefined,
              status: w.status,
              created_at: w.created_at,
              updated_at: w.updated_at,
            } as Appointment;
          }),
        );
        set({ appointments, isLoading: false });
      } catch (error: any) {
        set({
          error: error.message || 'Failed to load appointments',
          isLoading: false,
        });
      }
    },

    createAppointment: async (data) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      set({ isLoading: true, error: null });
      try {
        const d = data as any;
        const { title, provider, appointment_type, date_time, location,
          duration_minutes, reason, notes } = d;
        const encrypted_data = await encryptJson({
          title, provider, appointmentType: appointment_type,
          dateTime: date_time, location, durationMinutes: duration_minutes,
          reason, notes,
        }, key);
        const wire = await apiService.createAppointment({
          profile_id: d.profile_id,
          encrypted_data,
          status: d.status,
        });
        // Build the domain Appointment for the store.
        const appointment: Appointment = {
          appointment_id: wire.appointment_id,
          id: wire.id,
          user_id: wire.user_id,
          profile_id: wire.profile_id,
          title, provider, appointment_type, date_time,
          location, duration_minutes, reason, notes,
          status: wire.status,
          created_at: wire.created_at,
          updated_at: wire.updated_at,
        };
        set((state) => ({
          appointments: [...state.appointments, appointment],
          isLoading: false,
        }));
      } catch (error: any) {
        set({
          error: error.message || 'Failed to create appointment',
          isLoading: false,
        });
        throw error;
      }
    },

    updateAppointment: async (id, data) => {
      const key = getActiveProfileDek();
      if (!key) {
        set({ error: 'No encryption key — cannot encrypt data' });
        throw new Error('No encryption key');
      }
      try {
        const d = data as any;
        const { title, provider, appointment_type, date_time, location,
          duration_minutes, reason, notes } = d;
        const encrypted_data = await encryptJson({
          title, provider, appointmentType: appointment_type,
          dateTime: date_time, location, durationMinutes: duration_minutes,
          reason, notes,
        }, key);
        const wire = await apiService.updateAppointment(id, {
          encrypted_data,
          status: d.status,
        });
        set((state) => ({
          appointments: state.appointments.map((a) =>
            a.appointment_id === id
              ? { ...a, ...data, status: wire.status, updated_at: wire.updated_at }
              : a,
          ),
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to update appointment' });
        throw error;
      }
    },

    deleteAppointment: async (id) => {
      try {
        await apiService.deleteAppointment(id);
        set((state) => ({
          appointments: state.appointments.filter((a) => a.appointment_id !== id),
        }));
      } catch (error: any) {
        set({ error: error.message || 'Failed to delete appointment' });
        throw error;
      }
    },

    clearError: () => set({ error: null }),
  })),
);